Zip two lists of Integers.
If the lists are of unequal length, return
None; otherwise return
Some of (int*int) list.
Following naïve solution recurses over elements of the lists, and creates tuple, as part of the zip operation. If both lists are empty, it returns
The unequal length case is handled by the pattern outlined in line 8 , which simply returns
None. Subsequent return calls of the recursion detect it and simply return
Thus, resultant signature of
zipTwo is given by: